And he had already led astray from among you much of creation, so did you not use reason?
The Saheeh International Quran Translation
وَلَقَدْ أَضَلَّ مِنكُمْ جِبِلًّا كَثِيرًا أَفَلَمْ تَكُونُوا۟ تَعْقِلُونَAnd he had already led astray from among you much of creation, so did you not use reason?